Description
PMC-Sierra’s RM7000 is a highly integrated symmetric superscalar microprocessor capable of issuing two instructions each processor cycle. It has two high-performance 64-bit integer units as well as a high-throughput, fully pipelined 64-bit floating point unit. To keep its multiple execution units running efficiently, the RM7000 integrates not only 16 KB 4-way set associative instruction and data caches but backs them up with an integrated 256 KB 4-way set associative secondary as well. For maximum efficiency, the data and secondary caches are write-back and non-blocking. An optional external tertiary cache provides high-performance capability even in applications having very large data sets.
A RM5200 Family compatible, operating system friendlymemory management unit with a 64/48-entry fully associative TLB and a high-performance 64-bit system interface supporting multiple outstanding reads with out-of-order return and hardware prioritized and vectored interrupts round out the main features of the processor.
The RM7000 is ideally suited for high-end embedded control applications such as internetworking, high-performance image manipulation, high-speed printing, and 3-D visualization. The RM7000 is also applicable to the low end workstation market where its balanced integer and floating-point performance and direct support for a large tertiary cache (up to 8 MB) provide outstanding price/performance.

FEATUREs
• Dual Issue symmetric superscalar microprocessor with instruction prefetch optimized for system level price/performance
   • 200, 250, 266, 300 MHz operating frequency
   • >500 Dhrystone 2.1 MIPS @ 300 MHz
• High-performance system interface
   • 1000 MB per second peak throughput
   • 125 MHz max. freq., multiplexed address/data
   • Supports two outstanding reads with out-of-order return
   • Processor clock multipliers 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9
• Integrated primary and secondary caches — all are 4-way set associative with 32 byte line size
   • 16 KB instruction, 16 KB data, 256 KB on-chip secondary
   • Per line cache locking in primaries and secondary
   • Fast Packet Cache™ increases system efficiency in networking applications
• Integrated external cache controller (up to 8 MB)
• High-performance floating-point unit — 600 MFLOPS maximum
   • Single cycle repeat rate for common single-precision operations and some double-precision operations
   • Single cycle repeat rate for single-precision combined multiply-add operations
   • Two cycle repeat rate for double-precision multiply and double-precision combined multiply-add operations
• MIPS IV Superset Instruction Set Architecture
   • Data PREFETCH instruction allows the processor to overlap cache miss latency and instruction execution
   • Single-cycle floating-point multiply-add
• Integrated memory management unit
   • Fully associative joint TLB (shared by I and D translations)
   • 64/48 dual entries map 128/96 pages
   • Variable page size
• Embedded application enhancements
   • Specialized DSP integer Multiply-Accumulate instructions, (MAD/MADU) and three operand multiply instruction (MUL)
   • I&D Test/Break-point (Watch) registers for emulation & debug
   • Performance counter for system and software tuning & debug
   • Fourteen fully prioritized vectored interrupts - 10 external, 2 internal, 2 software
• Fully static CMOS design with dynamic power down logic
• RM5271 pin compatible, 304 pin TBGA package, 31x31 mm